They strip out certain features so that you will have to "buy up."
--
JohnE

Exactly - I may have to buy up to a D800!
--
Marvin

Your post made me experiment a bit, my tt1 mini in hot shoe seems to work fine with sc-29 on top firing sync corded sb800 and remote flex 5/sb800 in full ttl with no sync speed restrictions. SB800 is set to master on sync cord to control remote speedlights. What pocket wizards are you using. I assume sync cord is for flash bracket ? I’ll be waiting to see what PW says about D600 support